CN103048238A - Testing method of viscosity reducing rate of surfactant for preparing thickened oil viscosity reducer - Google Patents
Testing method of viscosity reducing rate of surfactant for preparing thickened oil viscosity reducer Download PDFInfo
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Abstract
The invention discloses a testing method of a viscosity reducing rate of a surfactant for preparing a thickened oil viscosity reducer. The testing method comprises the following steps: (a) preparing simulated stratum water and extracting a thickened oil sample for further use; (b) adding the surfactant into the simulated stratum water according to a certain ratio and uniformly agitating to prepare a surfactant solution; (c) dissolving the thickened oil sample into the surfactant solution according to a certain ratio; (d) standing the mixture in a constant-temperature water bath for a period of time; (e) measuring the viscosity of generated emulsion through a viscometer; and (f) taking a viscosity reducing effect as an index for estimating the surfactant to calculate the viscosity reducing rate of the surfactant. According to the testing method disclosed by the invention, the viscosity reducing rate of the surfactant can be rapidly tested; the testing precision is high and the testing cost is low; and the testing method provides data support to the extraction of the thickened oil, so that the performance of the prepared thickened oil viscosity reducer is more excellent.
Description
Technical field
The present invention relates to a kind of method of testing for preparing the surfactant viscosity break ratio of heavy crude thinner.
Background technology
Powerful in petroleum demand, price of oil going up sky-high, under the background of Conventional Heavy Oil production declining, petroleum industry is just turning to thickened oil recovery at the emphasis in many places, the whole world.The chances are 9～13,000,000,000,000 barrels (1.4～2.1 tcms) for the Global Oil resource,
Conventional Heavy Oil only account for wherein 30%, all the other all are viscous crude, super viscous crude and pitch.Viscous crude and tar sand resource are important energy source in the world, and about 4,000 hundred million tons of present global workable reserve is 2.7 times of 1,500 hundred million tons of Conventional Heavy Oil workable reserve.
Along with Gong the utilization of conventional oil reduces day by day, heavy oil is becoming the next century mankind's important energy source.Through the effort in more than 20 years, global heavy oil industry had than conventional oil speed of development faster, and the annual production of viscous crude, tar sand rises to nearly hundred million tons by 2,000 ten thousand tons, and its importance receives people's concern day by day.The difficulty of heavy crude reservoir exploitation is mainly manifested in two aspects: the viscosity of viscous crude is high on the one hand, and the filtrational resistance of viscous crude in oil reservoir is large, so that viscous crude can not flow into the shaft bottom from oil reservoir; Even on the other hand under reservoir condition, viscous crude can flow into the shaft bottom, but in the process of vertical lifting, because the impact of viscous crude factor such as degassed and radiating and cooling in pit shaft, so that the viscosity of viscous crude further increases, have a strong impact on the normal operation of the mobile and oil well production equipment of resident fluid in pit shaft.
According to the interrelated data statistics, explored heavy oil resource mainly concentrates on the states such as Venezuela, USSR (Union of Soviet Socialist Republics), the U.S. and Canada in the world at present.The Orinoco heavy oil belt of Venezuela northeast is examined geologic reserve and is reached more than 3,000 hundred million tons.Half of U.S.'s heavy oil resource is distributed in Gary Fu Niya, nearly 40,000,000,000 tons of geologic reserve, remaining half be distributed in the continent, middle part.Canadian heavy oil resource mainly is distributed in four major sedimentary mineral reserve such as Sa Pascal, cold air lake, dimension Pascal and this river of Alberta, nearly 1,500 hundred million tons of geologic reserve.The heavy oil resource of USSR (Union of Soviet Socialist Republics) mainly is distributed in more than 200 hundred million tons of the Ba Sainuofuyue in West Siberia basin, comprises that also there is extremely abundant viscous crude resource in other country of China.Total geologic reserve of these heavy oil resources adds up more than 6,000 hundred million tons, and in the world conventional oil verify 3,600 hundred million tons of geologic reserve, its workable reserve only is 90,000,000,000 tons.
The viscous crude stock number that China has found is also very abundant, and oneself has more than 20 the viscous crude field of discovery, is distributed in the areas such as the Liaohe River, triumph, Xinjiang, huge port, Jilin, estimates that Chinese heavy petroleum asphalt stock number can reach more than 300 * 108t.China's viscous crude (highly viscous oil, viscosity is more than 0.1Pas) resource distribution is very wide, and geologic reserve reaches 164 * 108t, and wherein the land viscous crude accounts for more than 20% of oil total resources.The outstanding characteristics of viscous crude are that bituminous matter, gum level are higher.Colloid, the heavy oil production that asphalt content is higher account for 7% of viscous crude total production.
Connect the area in Daqing oil field, Henan, Inner Mongol two in recent years and found important heavy crude reservoir; Also find the viscous crude resource in areas such as Jianghan Oil-field, little, the Northwest Sichuan of peace.Heavy crude reservoir geologic reserve explored and control has surpassed national common thin oil reserves, estimates also to have from now on new growth.
In the proven reserves of CNPC, common heavy oil accounts for 74.7%, and special viscous crude accounts for 14.4%, and super viscous crude accounts for 10.9%.
Countries in the world mainly rely on traditional thermal methods to the exploitation of high viscosity heavy oil at present, i.e. steam stimulation and steam flood.The supporting technology that China's great majority adopt steam stimulation and pit shaft to mix thin oil is recovered the oil.This method not only consumes a large amount of fuel, but also consumes a large amount of thin oils, thereby has increased widely cost for oil production.Have bibliographical information can use the Emulsifying heavy crude producing, this method is that water phase surfactant mixture is annotated the down-hole, makes full-bodied viscous crude change low viscous water external emulsion extraction into.Reducing viscosity by emulsifying is because its viscosity break ratio is high, low, the easy operating of cost, and at home and abroad all there is use in the oil field at present.But the emulsifying pour depressor that uses at present only possesses single heatproof or anti-rock salt performance, namely heatproof again the emulsifying pour depressor of anti-rock salt research and development also seldom.
In the process of preparation heavy crude thinner, all can add surfactant, this just needs the viscosity break ratio of test surfaces activating agent, for the preparation heavy crude thinner provides Data support.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of method of testing for preparing the surfactant viscosity break ratio of heavy crude thinner is provided, this method of testing can test out the viscosity break ratio of surfactant fast, and measuring accuracy is high, testing cost is low, for the exploitation of viscous crude provides Data support, thereby so that the performance of the heavy crude thinner of preparing is more superior.
Purpose of the present invention is achieved through the following technical solutions: the method for testing of the surfactant viscosity break ratio of preparation heavy crude thinner may further comprise the steps:
(a) preparation simulated formation water, and it is for subsequent use to extract the viscous crude sample;
(b) surfactant is added simulated formation water according to a certain percentage, stirring makes surfactant solution;
(c) be dissolved in according to a certain percentage the viscous crude sample in the surfactant solution;
(d) place water bath with thermostatic control a period of time;
(e) measure the emulsion fluid viscosity that generates by viscosity meter;
(f) with the index of viscosity reducing effect as the evaluation table surface-active agent, calculate the surfactant viscosity break ratio.
In the described step (b), the content of surfactant is 0.5% in the surfactant solution.
In the described step (c), the blending ratio of viscous crude sample and surfactant solution is 3: 7.
In the described step (c), the temperature of water bath with thermostatic control is below 60 ℃.
In the described step (e), viscosity is counted NDJ-79 type rotational viscosimeter.
In sum, the invention has the beneficial effects as follows: can test out fast the viscosity break ratio of surfactant, and measuring accuracy is high, testing cost is low, and for the exploitation of viscous crude provides Data support, thereby so that the performance of the heavy crude thinner of preparing is more superior.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
Embodiment:
The method of testing of the surfactant viscosity break ratio of the preparation heavy crude thinner that present embodiment relates to may further comprise the steps:
(a) preparation simulated formation water, and it is for subsequent use to extract the viscous crude sample;
(b) surfactant is added simulated formation water according to a certain percentage, stirring makes surfactant solution;
(c) be dissolved in according to a certain percentage the viscous crude sample in the surfactant solution;
(d) place water bath with thermostatic control a period of time;
(e) measure the emulsion fluid viscosity that generates by viscosity meter;
(f) with the index of viscosity reducing effect as the evaluation table surface-active agent, calculate the surfactant viscosity break ratio.
In the described step (b), the content of surfactant is 0.5% in the surfactant solution.
In the described step (c), the blending ratio of viscous crude sample and surfactant solution is 3: 7.
In the described step (c), the temperature of water bath with thermostatic control is below 60 ℃.
In the described step (e), viscosity is counted NDJ-79 type rotational viscosimeter.
As shown in the table by the result that said method records:
As seen from the above table: the new vertical viscosity of thickened oil of viscous crude in the time of 50 ℃ that adds surfactant, more much smaller than the viscosity that does not add surfactant, and best with non-ionic surfactant OPEO, NPEO viscosity reducing effect, viscosity break ratio all reaches more than 60%, so select non-ionic surfactant OPEO, NPEO and anionic surfactant DBS as the optimal tables surface-active agent of this experiment, carry out compositely with NaOH, and determine the optimum formula of surfactant by the Latin orthogonal test method.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction, and every foundation technical spirit of the present invention, any simple modification, equivalent variations to above embodiment does all fall within protection scope of the present invention.
Claims (5)
1. the method for testing of the surfactant viscosity break ratio of preparation heavy crude thinner is characterized in that, may further comprise the steps:
(a) preparation simulated formation water, and it is for subsequent use to extract the viscous crude sample;
(b) surfactant is added simulated formation water according to a certain percentage, stirring makes surfactant solution;
(c) be dissolved in according to a certain percentage the viscous crude sample in the surfactant solution;
(d) place water bath with thermostatic control a period of time;
(e) measure the emulsion fluid viscosity that generates by viscosity meter;
(f) with the index of viscosity reducing effect as the evaluation table surface-active agent, calculate the surfactant viscosity break ratio.
2. the method for testing of the surfactant viscosity break ratio of preparation heavy crude thinner according to claim 1 is characterized in that, in the described step (b), the content of surfactant is 0.5% in the surfactant solution.
3. the method for testing of the surfactant viscosity break ratio of preparation heavy crude thinner according to claim 1 is characterized in that, in the described step (c), the blending ratio of viscous crude sample and surfactant solution is 3: 7.
4. the method for testing of the surfactant viscosity break ratio of preparation heavy crude thinner according to claim 1 is characterized in that, in the described step (c), the temperature of water bath with thermostatic control is below 60 ℃.
5. the method for testing of the surfactant viscosity break ratio of preparation heavy crude thinner according to claim 1 is characterized in that, in the described step (e), viscosity is counted NDJ-79 type rotational viscosimeter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103452550A (en) * | 2013-09-12 | 2013-12-18 | 中国石油大学(华东) | Viscosity reducing effect evaluation method and device of heavy oil viscosity reducer under stratum seepage condition |
| CN113175315A (en) * | 2021-05-27 | 2021-07-27 | 新疆正通石油天然气股份有限公司 | Fracturing process for improving fracturing yield increase effect |
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2011
- 2011-10-13 CN CN 201110326237 patent/CN103048238A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103452550A (en) * | 2013-09-12 | 2013-12-18 | 中国石油大学(华东) | Viscosity reducing effect evaluation method and device of heavy oil viscosity reducer under stratum seepage condition |
| CN103452550B (en) * | 2013-09-12 | 2016-03-16 | 中国石油大学(华东) | Heavy crude thinner viscosity reducing effect evaluation method and device under a kind of stratum filtration condition |
| CN113175315A (en) * | 2021-05-27 | 2021-07-27 | 新疆正通石油天然气股份有限公司 | Fracturing process for improving fracturing yield increase effect |
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Application publication date: 20130417 |